Die stock



April 1o, 1934.

w. A. PHlLLls 1,953,974

DIE STOCK Filed Deo. 22, 1930 2 Sheets-Sheet 1 am iL MMU, @gw JMW April 10, 1934.

DIE STOCK Filed Dec. 22, 1930 Y 2 Sheets-Sheet 2 8 N ,2 1&9

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Patented Apr. 10, 1934 -UNIT-El) `STATES DIE STOCK William A. Phillis, Warren, Ohio, assigner to The Borden Company, Warren, Ohio, a corporation Application December 22, 1930, Serial No. 503,895

11 Claims.

This invention relates to a die stock of that type wherein the chasers are iixedly mounted in radial notches in a suitable head which has a projecting sleeve, adapted to enter into an actu- The frame preferably carries a ratchet pawl which engages teeth formed on or carried by the sleeve. i

Such type of die stock is on the market in different forms. Frequently the head is an uninterrupted annulus except for the chaser notches. While such form is effective for holding the chasers, it has a defect in not providing desirable clearance openings for the chips. On the other hand, sometimes in place of a solid head, isolated notched projections have been employed, the chasers being held in the notches by a ring secured to the projections, but in such case, while there is ample clearance opening between the projections for the chips, the die stock lacks rigidity, and, occasionally, the chaser-carrying projections are sprung or broken off, particularly in the larger sizes of die stock.

` It is the object of this invention to provide a die stock of the type mentioned which shall have the desired clearance openings and shall also be very strong and rigid, adaptedior effectively holding the chasers even in the largest sizes of tools. I accomplish the desired result by making a head which is continuously annular at its opposite faces (except for the chaser notches) but has openings through its wall between the chaser notches, which openings are entirely surrounded by metal of the head. The head is thus continuously bridged by integral metal from one chaser notch to the other along the outer side of the openings, as well as the inner side. This eiectively holds the chasers and greatly reduces the chance of breakage, and at the same time provides ample clearance space for the chips.

In the preferred form of my die stock, I make the clearance opening of peculiar shape, as is hereinafter more fully explained, to allow not only very ready clearance for the chips, but easy access, for an oil can to oil the chasers most effectively-at their cutting teeth.

My die stock is illustrated in the drawings hereof and is more fully described and its essential novel characteristics are summarized in the claims.

In the drawings, Fig. 1 is a face Aview of my die stock; Fig. 2 is a transverse section thereof on the radial planes indicated in the line 2-2 of Fig. 1; Fig. 3 is a section in a plane parallel with Fig. 1 through the clearance openings, as indicated by line 3--3 in Fig. 2; Fig. 4 is a development of a portion oi the exterior of 'the chaser carrying head; Fig. 5 is a corresponding 60 development of a Vportion of the interior of head; Fig. 6 is a side elevation `of the die stock; Figs. '7 to 10 inclusive are fragmentary sections through the die stock head on planes indicated through the correspondingly numbered lines in 66 Fig. 6`

As illustrated in Figs. l, 2 and 3, the chaser carrying member of my die stock comprises a sleeve 10 having an outwardly extending flange 11 from which rises a cylindrical wall 12. The 70 wall has radial notches 13 in which are mounted the chasers 20. Between the chasers, openings 15 are made through the wall formed as hereinafter described.

'I'he chasers mounted in the radial notches 13 75 rest at their inner edges against the flange 13. They are clamped in place by means engaging their outer edges. This means is shown as comprising a ring 30 held in place by cap screws 31, passing through openings in the ring and threaded into the wall 12.

To prevent radial movement of the chasers, each chaser is shown as provided with a projecting pin 22 which occupies an opening 32 in the ring. 30. The chaser frame, the chasers, clamping ring and screws form one rigid unit in operation.

To rotate the chaser frame, I have providedl an annular row of teeth 14, located intermediately on the sleeve portion 10, which teeth are adapted to be engaged by a pawl 41 mounted in a driving frame 40 surrounding the sleeve 10. The pawl is shown as slidably mounted in a housing portion 42 of the frame; it is pressed inwardly by a spring 43 surrounding a shank of the pawl 95 and bearing at its inner end against the head of the pawl and at its outer end against a plug 44 screwing intothe housing 42.

A head`45 on the pawl shank enables the pawl to be pulled out radially and freed from the teeth. Thereupon if desired, the pawl may be reversed to act in the other direction. The pawl head has an abrupt face with an inclined backing so that it moves idly over the teeth in one direction but m5 drives them when moved in the opposite direction. When the pawl is in either of its active positions, a blade 46 on the head may engage notches on the housing 42to prevent rotation of the pawl. When the pawl is withdrawn, if it is 11,0

pas

turned in less than one-half turn, the blade 46 will raise on the end of the housing 42 and hold the pawl idle.

The oscillating frame 40 is shown as provided with a socket 48 which may be occupied by an operating handle 49. As shown in Fig. 2, the face of the teeth 14 is set back slightly from the periphery of the adjacent sleeve portions so that, in normal use, the paWl head is not forced entirely free from the sleeve, and the sleeve is prevented from dropping out of the driving frame. However, when desired, an abnormal outward pull on the knob 45 will entirely withdraw the pawl so that the chaser carrying frame may be taken out of the driving frame.

I will now describe particularly the construction of the clearance openings 15 in the chaser head 12. As will be apparent from the various iigures, these openings in the mid-region of the wall are substantially circular as indicated in Figs. 4 and 5. Outside of this, the openings iiare in the opposite directions, as at 16, to approximately elliptical mouths, While in the inner portion of the wall, the openingsflare as at 17, toward the ilange 11, and thus have inner trianguloidal mouths. This construction of opening leaves ample metal on opposite sides of the chaser to effectively hold it. At the same time, there is a through passageway, in a direction substantially tangent to the inner periphery of the die stock head, leading to the cutting teeth of each. chaser.

The form of opening described allows the ready insertion of the spout of an oil can, as indicated at A in Fig. 10. The direction of the ilaring portion 17 toward the Iiange 11 guides the oil can to the tooth of the Chaser which iirst engages the Work, which is Where the oil should be placed. It also provides a very eiiective cleai1m ance passageway for the chips which are made by the advance tooth, which are the most troublesome in practice.

Now it will be seen from an inspection of Figs. 2, 4, 5 and 6, that though I have provided the clearance and oil openings leading directly from the chaser teeth, I have not weakened the Chaser housings, for each housing is bridged to the next by a portion of the wall 12 extending over the opening, clearly illustrated at 19. The housings are further strengthened by a truss or buttress arrangement whereby metal of the wall fills in the corners and braces the chaser notches to the flange 11 below, or the bridge 18 above, the openings. In my preferred embodiment, the metal of the wall 12 forms buttresses which start as in Fig. 4, from the midregion of the Chaser teeth measured axially of the head) and slope in both directions to a point midway between housings; or as in Fig. 5, the bracing is from the first-acting chaser teeth to the bridge 18. In Figs. 4, 5 and 6 the point where such sloping buttresses meet is opposite the central portion of the opening 15. It will be obvious that these buttress portions distribute the forces acting o-n the chaser teeth either to the flange 11 or to the bridging portion 18. This bracing is important, for occasionally the chasers encounter an unduly hard spot in the pipe being threaded, or a crystal embedded in the pipe, or an irregularity in pipe form which throws undue stress on the chaser tending to spring it tangentially. This eilect is especially noticeable in the larger sizes of pipes. Now my bridges across the openings effectively prevent such springing action oi" the chaser housings,

holding them rigidly in position and preventing breakage.

It will be noticed that each of the doubly flared openings 15, 16, 17 is formed in the same manner in each arcuate direction. Accordingly the chaser frame is equally suitable for right hand chasers and left hand chasers. The bridge 18 across the top of the openings so stiiens the portions of the wall which constitutes the Chaser housings that they may be out back equally on both sides without unduly weakening the portion of the wall which receives the thrust, namely, that on the afterside of the chaser in its direction of use.

The height of the chaser-carrying wall is preferably slightly less than that of the chasers so that the clamping ring bears directly on the chasers. The Wall may be provided with longitudinally projecting arcuate flanges along the inner edge as illustrated at 19 to Center the clamping ring 30 as shown in Fig. 2. It will be noticed that by making the continuous bridges from one Chaser notch tothe next, the machining of the end of the wall l2 to receive the clamping plate is a simple matter. The openings 15 may be readily formed by cores when the chaser frame is cast, and, thereafter, it is only necessary to machine in a suitable lathe the end of the wall 13 and cut the radial notches for the chasers.

l. In a die stock, a chaser carrying frame having a wall, notches in said wall, chasers occupying the notches, openings through the wall between the chaser notches, which openings are bridged by the material of the wall, said openings diverging as they approach the inner face of the wall so as to terminate adjacent the teeth of the chasers, the divergence being greatest adjacent the first acting teeth.

2, In a die stock, the combination of a chaser carrying frame having a notched annular wall,

chasers occupying the notches, openings through the wall between the chaser notches, which openings are bridged by the material of the wall, said openings in the inner portion of the wall flaring from an intermediate region of the wall inwardly toward the chasers and in the outer portion of the wall also flaring toward the Chasers, the ilare in the inner region of the wall being greater toward the innermost portion of the wall measured longitudinally.

3. In a die stock, the combination of a rotary frame having an annular head interrupted by notches to carry the chasers, there being openings through the head between the chaser notches, which openings are entirely surrounded by the material of the head and which openings are substantially circular in the mid-region of the wall and ilaring in the inner portion of the wall in opposite directions toward the rst acting Chaser teeth in a direction substantially tangent to the inner periphery of the die stock head, and flaring in the outer portion of the wall in opposite directions toward the mid-region of the chaser heel.

4. In a die stock, a Chaser carrying frame comprising a sleeve, a flange extending outwardly therefrom, an annular wall carried by the flange, said wall having radial notches and having openings through the wall between the notches, said openings being arched across at the top by the metal of the wall, said openings on the inner side of the wall adjacent the flange diverging toward the chaser notches, the diverging openings leading to a point immediately adjacent the first acting chaser teeth on both sides of the notches.

5. In a die stock, a chaser carrying frame having an annular head interrupted by radial notches adapted to receive chasers, the head being substantially solid between the notches except for an opening comprising a small hole mid-way between the chaser notches, and flares extending therefrom inwardly and outwardly, the inner fiare leading to a region adjacent the first acting chaser tooth.

6. In a die stock, a chaser carrying frame having an annular wall interrupted by notches to carry the chasers, there being openings through the wall between the chaser notches, which openings are entirely surrounded by the material of the head, and the inner portion of the wall adjacent the chaser teeth having radial clearance greater adjacent the first acting teeth than adjacent the other teeth.

,7. In a die stock, a chaser carrying frame comprising a sleeve, a flange extending outwardly therefrom, an annular wall carried by the ange, said wall having radial notches and having openings through the wall bridged across at the top by the metal of the wall and at the bottom substantially adjacent to the flange, said openings diverging on the inner side of the wall toward the chaser notches, the divergence adjacent the flange providing a passageway leading immediately from the first cutting edge of the chaser, and the divergence further removed from the flange starting from a point on the inner wall spaced from the chaser notch.

8. In a die stock, the combination of a rotary frame having an annular wall interrupted by notches to carry chasers, there being openings through the wall between the chaser notches, which openings are entirely surrounded by the material of the wall, the material between the openings and notches measured in a circumferential direction being thickest in the mid-portion of the wall, and which openings in the inner portion of the wall flare in opposite directions toward the rst acting chaser teeth in a direction substantially tangent to the inner periphery of the die stock head, and in the outer portion of the wall fiare in opposite directions toward the mid-region of the chaser heels.

9. In a die stock, a sleeve, an annular ring extending outwardly therefrom, a cylindrical wall extending from the ring co-axially with the sleeve, radial notches in the wall adapted to receive chasers, there being chip discharge openings through the wall between the chaser notches, portions of the wall forming a second annular ring bridging over the openings, and portions of the wall sloping from the chaser notches to a point on one of said rings adjacent the midpoint of said openings.

10. In a die stock head, a cylindrical wall, radial notches in the wall providing housings adapted to receive chasers, openings through the wall between the chaser housings; two annular portions integral with the wall, one of said portions forming a flange under said openings and the other portion forming a bridge over said openings, and buttresses integral with said wall and extending from substantially the mid-height of the chaser housings to the respective annular portions and forming braces between the chaser notches and both of said portions.

11. In a die stock, a chaser carrying frame having a wall, notches in said wall, chasers oc cupying the notches, there being small openings through the wall between the chaser notches, which openings are bridged by the material of the wall, said openings being smallest in substantially the mid-region of the wall and flaring therefrom both inwardly and outwardly toward the chasers, the distance across said openings at the inner and outer peripheries of the wall being substantially greater than the clear space of the opening in the mid-region of the wall, and the inwardly flaring portions terminating near the sides of the teeth.

WILLIAM A. PHILLIS. 

